[AT] OT truck tires/driveshaft?

[charlie hill]

I'm leaning toward drive shaft too John.
Does the truck have a 2 speed rear axle?
If so run it down the road in low range and
see if you get the same vibration at a slower
speed but at about the same RPM if you do it's
in the driveshaft.  If not then it's most likely in
the tires or perhaps an axle bearing.

Charlie


-----Original Message----- 
From: Ron Cook
Sent: Sunday, May 11, 2014 6:18 PM
To: Antique tractor email discussion group
Subject: Re: [AT] OT truck tires/driveshaft?

John,
     Does it change any by greasing the U-joints?  If it changes even a
little bit, then I would say a U-joint going bad.  Or how about a hangar
bearing?

Ron Cook
Salix, IA
On 5/11/2014 4:29 PM, jtchall at nc.rr.com wrote:
> Been a little quiet so I’ll throw a problem out looking for suggestions. 
> Got a 74 Ford F-600 2 ton grain truck. Around 40 mph I get a BAD vibration 
> (empty or loaded) It goes away around 50 or so. I put new tires on the 
> front a couple years ago and moved one of the old ones to the back. 
> Shortly thereafter we noticed the vibration. It seems to be getting worse. 
> I had the front tires balanced last fall, didn’t help. I shuffled tires 
> around on the back yesterday, can’t really improve the situation. I even 
> tried driving with only the inside tire mounted, maybe some better, but 
> not much. The back tires are not a matched set and are pretty old. I know 
> it could use a set of tires but I’m trying to hold off a little while 
> longer buying them. I jacked the truck up so I could look for runout and 
> wobble. Some of the tires have wobble, some have runout on the diameter. 
> One is perfect, but it is so far out of balance that with the truck in 
> neutral, it settles to the same place every time—I even replaced this with 
> a spare, still haven’t solved the problem. Would a set of new tires solve 
> my problem or are big old trucks like this forgiving enough that I have 
> other trouble? All the u-joints feel tight and I only notice a faint bit 
> of runout on the driveshaft. An old timer told me he thinks I have a 
> u-joint trying to lock up or a twisted driveshaft. Dad says they once 
> twisted a driveshaft on a truck we had by popping the clutch when it 
> started rolling backwards. Whats your opinion?
>
> John Hall
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